Fatal1ty x399 won't post with 128GB RAM

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 128noGB wrote:

Thanks for the response!  I'll try and respond to every point:

---->  If indeed it is a 128GB Kit, check that ALL serial numbers are consecutive.

Just took them all out, yes all sticks are numbered in perfect order.  Also they say this on the RAM:

CMK128GX4M8B3000C16
DDR4 128GB(8x16GB)
3000Mhz
16-18-18-36
1.35v
ver 5.39

---->   Is this occurring before or after you set XMP?

I can't get into the BIOS to set XMP with 8 sticks.

Instead, I can 1 to 7 sticks, enter the BIOS, change settings, save and exit and power off, then plug in the 8th stick, then power on.

I'm performing this exactly as I type it:

-- Remove all RAM sticks
-- Populate A2 B2 with 1 stick each
-- Power on and enter BIOS
-- F9 and reset bios to default.  Reboot. Enter into bios
-- Change XMP profile to XMP 2.0 Profile 1
-- Save and exit
-- Populate all 8 RAM sticks, reboot
-- System will not boot/POST, hangs on:  Dr. Error   C0    before rebooting

---> You don't say what GPU it is you have. One in particular drew(before a
 vBIOS update) an inordinate and out of spec power draw from the PCIe 
bus.

EVGA Geforce 1060 SC.  It has a 6 pin connector.  I've also tried with a secondary GTX970.  Both are the same.  I also tried plugging in the PCIe power into the motherboard.  All 4 power are filled.

SIDE NOTE:  This motherboard has a completely exposed PCIi power connector wiring right next to the motherboard reset/power on switches.  A finger needs to simply be off by less 1 inch before some serious hard to the end-user could occur.  Unlike the entirety of the rest of the mobo, this one has completely exposed power receptacles. 

--> Pull all the power connections and look at the mating M and F parts

Done and no change.   It should be noted that this is my SECOND motherboard (returned the prior x399 Fatal1ty per Asrock recommendation) as well as my SECOND PSU (other was brand new as well).  New PSU was purchased on the side chance the CPU 2+2/4+4 power wasn't correct.

It almost looks as if the bios says this:  "Hmm, 8 sticks of RAM?  No post.  I don't care what settings just don't POST".

I don't know if this will help you, but I see a detail in your description of your procedure that if changed, possibly might help you. No guarantee... sorry to say. If you've done this already, never mind.

Insert all eight DIMMs into the board, if they are not already there. Clear the UEFI/CMOS with the jumper on the board. Yes I want you to try running your memory at stock, default speeds, NO XMP profile. Plus you should always clear the UEFI/CMOS when changing the memory configuration. Yes it worked for you without doing that in earlier testing with seven DIMMs, but with XMP enabled? Regardless, please try eight DIMMs without XMP, and a UEFI clear before starting the board with eight DIMMs installed.

With that much memory, you may not be able to run it all at 3000 without manual tweaking. Don't forget, most DDR4 memory like yours has the XMP profile tuned for Intel systems, not Threadripper or Ryzen. Your model of memory was first designed for Intel X99 board systems, the very first PC platform to use DDR4 memory. So while it may work with Threadripper, it was not designed for it.

http://www.corsair.com/en-us/vengeance-lpx-128gb-8x16gb-ddr4-dram-3000mhz-c16-memory-kit-black-cmk128gx4m8b3000c16

If you had seven DIMMs running above the stock speed, that was very good. But all it takes is one more to cause difficulty.

Next potential issue, common on Intel quad channel memory systems: POST completes and Windows boots fine. But not all of the memory is recognized. That will take voltage and memory settings tuning.

About the exposed power connector wiring, those look like the ground connections for that connector. While it looks scary, shorting the ground connections would do nothing.

Also, an M.2 SSD in the M.2 slot would not cause a problem with memory.